Milling-cutter



C. KLA LASSITEH. NHLUNG CUTTER.

APPLICANON FILED FEBl 17, 1920.

n PabentedNov. 16, 1920.

FIG- COLUMBUS K. LASSITER, OF RICHMOD, VIRGINIA.

MILLING-CUTTER.

Specification of Letters Patent. Patented NOV. 16 1920;

Application led February 17, 1920. Serial No. 359,224.

To I@ZZ w/lom t may concern:

Be it known that ILCoLUMnUs K. LAS- srrin, of Richmond, 1n the county ot Henrico and State of Virginia, have invented a certain new and usefulilmprovement in v)flilling-Cutters, of which improvement the following is a specification.

My invention relates to milling cutters of the inserted tooth type, and its object is' to provide an appliance of such type by which a continuous. helical cut may be made in slabbing, with reduced friction and operat-` ing power, as compared with prior constructions, and in which the cutting blades shall be firmly locked in operative position, with the capacity of ready removal and insertion as required.

The improvement claimedis hereinafter fully set forth. f

In the accompanying drawings: Figure 1 is a side view, in elevation, of a milling cutter embodying my invention; Fig. 2 an end view of the same; Fig. 3, a partialtransverse section, on an enlarged scale; Fig. 4, a top view of a cutting blade; and

Fig. 5, an end. view of the same.

ln the practice of my invention, referring deseriptively to `ythe specific embodlment thereof which/is herein exemplified, I provide a cylindrical cutter head or hub, 1 of any suitable' metal, as, preferably, high carbon steel, containingabout per cent. of

nickel, -which may either be integral or be` made up of a plurality of sections, dependent upon thedesiied length of the appliance, the cutter head having av central bore, la, for the passage of a'suitable driving mandrel.

A plurality of peripheral grooves, l", of lieliea-lly curved form, and rectangularl transverse section, that is to sayphaving parallel sides, is accurately cut, to -a proper depth and width, in the cutter head, and a (':orres'xondingly curved drop forged blade or cutter,.3 having parallel sides, e..of'

quadrangular section, is fitted neatly in each of said grooves. The cutter blades are pressed into the grooves, 1, in which they are held with a driving fit, by their con-- formity with the width andl curvature thereof, and they may, if desired, be tightened therein by swaging the metal of the cutter head against them, to facilitate which operation, shallow peripheral notches, l, maybe cut in the headbetween the cutter receiving grooves, l". In cases where the appliance is of such length as to require each cutting blade to comprise a plurality of sections, those of the alternate sets are made ofslightly diiferent lengths so as to break joints, as shown in Fig. l.

It has heretofore been vthe practice to lock the insertedvhelical cutting blades of lonnr milling cutters to the heads or hubs thereo by pouring metal between their sides and inclined sides formed 0n the grooves, and also to secure them in position by expansible wedging devices.` The objections to these fastening means are obviate'd, and the construction of the appliance simplified and economized by my invention, as above de` scribed.

.l claim as my Anvention and desire to secure by Letters Patent l l. The combination, in a milling cutter,

of a cylindrical cutter head o1' hub, having correspondingly curved cutting blades, each having parallel sides, and'of corresponding `width with a groove of the cutter head, and

engaging throughout its length, with the walls thereof, w1th a drlvmg t.

2. The combination, in a milling c-utte' r,'f

of a cylindrical cutter bead lorelrub, having a plurality of helicallyl lcurfved 'and parallel sided peripheral grooves,

and a plurality of curved cutting blades, A cach having parallel sides, and, of corresponding Width-with a groove of the cutter head, and engaging, throughout its length, `with the walls thereof, with a driving t. l

' COLUMBUS K. LASSITER Witnesses:

J. H. LINK, Rose ANDERSON.

.per1pheral"notches, interiosed between said grooves and a plurality of corresponding-ly'v 

